I bought the black/knotty oak color. (Apparently no longer available). The shelves are particle board. The website states the capacity of the shelves is 33lbs. They mean, collectively, all four shelves. The directions state, the capacity for each shelf: 13lbs , 13lbs. 6.6lbs and 6.6lbs. That adds up to 39.2lbs. So that information is incorrect.  I did not suspect, a buffet would only hold 6.6 lbs on an individual shelf since they are used for dishes. 
Depending on what you want it for, buyer beware. The picture of the one I purchased looks like the top is a warmer brown. It is in that washed out gray/tan color. My purchase is disappointing but I'm already too invested to return it. I hired a handyman friend to put it together and it's been 3+ hours. A professional who is used to this product will be faster and the $130. may be worth it, if a product of higher quality. I thought I was getting a deal, I just got a poor quality product.